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Maize is the most-produced cereal in the world, but its production faces constraintssuch as parasitic attacks from stem-borers. We evaluated the resistance of a core-collection of 18 maize lines by measuring their palatability to European Corn Borer (ECB) larvae fed on maize leaf discs. Usingan original consumption test device that takes into account the variability of larvae behavior, we were able to phenotype the resistance of the 18 maize lines. We matched consumption data to existing enzymatic and metabolomic data that characterized the maize core-collection and identified some metabolites such as caffeoyllquinate, trocopherol, digalactosylglycerol and tyrosine that are positively or negatively correlated with the palatability to ECB larvae. Altogether, our results confirm the metabolic complexity involved in the establishment of plant defenses. Metabolic changes mainly related to membrane and cell wall composition, particularly those related to the phenylpropanoids pathway, were observed independently of plant developmental pace and earliness.[condensée:]Metabolic changes associated to leaf palatability mostly concern membrane and cell wall composition. Some of them, pointing-out to the phenylpropanoids pathway, were observed independently of plant developmental pace and plant earliness. |
